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mail: audiologica@btinternet.com

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Questyle CAS192D

Questyle CAS192D

£ 1899.00

Item:

Price:

Questyle CAS192D - high performance True DSD DAC, superb build quality and uses the finest audiophile components


Unlike other DACs that claim DSD support, yet in actuality provide DoP (DSD over PCM), the Questyle Audio CAS192D accepts the DSD bit-stream directly from your computer, bypassing your computer’s audio processing and digital volume control as well as the Questyle Audio CAS192D’s digital filters, to provide True DSD, the way it was meant to be heard, without requiring expensive difficult to install proprietary connectors, or as is the case with DoP breaking up the bit-stream into 16bit packets and compressing them into a PCM data-stream and then uncompressing them at the other end, buffering them, then reassembling the bit-stream so that it may be sent to the DAC as DSD, all of which requires an extreme amount of processing at both the computer end and the DAC end to perform in real time (which invariably leads to latency, data loss, etc), not to mention a 33% increase in bandwidth requirements for the USB ports and cabling.


Currently the majority of DACs use FIR (finite impulse response) digital filters, but research and testing has shown that our ears are very sensitive to the pre-ring that FIR digital filters add to the impulse wave, making the music sound incoherent and unnatural. The Questyle Audio CAS192D offers the more advanced IIR digital filter, which completely eliminates the pre-ring from the impulse wave producing a more natural sound.


During every second of music, there are hundreds of thousands of time operations. Any micro errors will distort the sound. In the Questyle Audio CAS192D, a 3X clock USB asynchronous transmission structure ensures a more accurate operation. To obtain first class sound performance, three correspondence level clocks (custom made in Japan), individually control multiples of 44.1kHz, multiples of 48kHz and USB signal transmission, dedicated for USB asynchronous transmission, reduceing Jitter to undetectable levels. A three-clock integrated circuit with FIFO asynchronous architecture and three voltage-stabilized power stages ensure accurate sound.


When upsampling, 44.1kHz does not divide evenly into 192kHz, causing timing errors. To avoid this, CAS192D uses two clocks, with extremely low phase noise, thus the processor automatically identifies the sample rate and upsamples integrally. If the input data is 44.1kHz, it will be multiplied by 4 to 176.4kHz; if the input data is 48k, it will be multiplied by 4 to 192k, which avoids those negative effects. The upsampling is ASRC to avoid Jitter. On the front panel of the Questyle Audio CAS192D, there is an UPSAMPLING button to allow the user to choose whether to upsample or decode at the original sample rate (the current state of operation is displayed on the screen).

    DAC Chipset:  WM8741


    Digital Filters in PCM mode: 5 switchable IIR (MP) and FIR (LP) filters


    Digital Filters in DSD mode:  NO


    Upsampling in PCM mode:  Dual Clock integral upsampling, ON/OFF switchable


    OS for USB input: Win XP,Vista,Win7,Win8 and Mac OS


    Media Player for USB input: Any player


    Core Audio for USB input: WASAPI,ASIO,KS


    Output amplitude RCA :2.44Vrms,   XLR :4.88Vrms


    THD+N:< 0.005%


    SNRRCA:115 dB,XLR:116 dB


    Digital Input:USB、SPDIF, PCM 44.1K-192K/16-24bit


    USB Input:44.1K-192K/16-24bit PCM and True DSD


    Analogue output:Balanced(XLR) and unbalanced(RCA)


    Dimensions:  330*300*55MM

Questyle CAS192D